1. sand dunes that were upbuilt by the wind.
   由风垒起来的沙丘
2. Each functional module of WLTVAS is upbuilt, and the analysis of each functional module is finsihed.
   确定软件的各个功能模块，并完成各个模块的功能分析。
3. By using abrasive wearing equipment upbuilt by the authors, the wear resistance were determined.
   采用作者自行建立的磨料磨损试验方法，测定了它们的质量磨损百分率（即耐磨性）；
4. In this scheme we put forward the concept of matrix pool on which our key predistribution scheme is upbuilt，and encrpytion scheme is introduced into the process of key transfer.
   该方案提出了矩阵池的概念，将密钥的预配置建立在多个密钥矩阵之上，节省了节点的存储空间，增强了网络的可扩展性。将加密传输机制应用到密钥的传输过程中，增强了密钥传输过程中的安全性。

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